Question

Cho A=n-5/n+1 bằng 1/2 .Tìm n

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Answer 1

\(\frac{n-5}{n+1}=\frac{1}{2}\left(n\ne-1\right)\)

\(\Leftrightarrow2n-10=n+1\)

\(\Leftrightarrow n=11\)(tm)

vâỵ n=11

Answer 2

Theo bài ra ta có:

A=\(\frac{n-5}{n+1}=\frac{n+1-6}{n+1}=\frac{n+1}{n+1}-\frac{6}{n+1}\)

\(\Rightarrow\)\(1-\frac{6}{n+1}=\frac{1}{2}\)

\(\Rightarrow\frac{6}{n+1}=\frac{1}{2}\)

\(\Rightarrow n+1=12\)

\(\Rightarrow n=11\)